By the time they were ready to depart, school had begun.

在他们准备离开的时候，功课已经开始了。

youdao

The summer vacation for primary school had begun! So many parents and their kids joined in the games here.

小学的暑假开始了，有许多的父母带着孩子们来这里参加游娱活动。

youdao

Arriving at the school, we found that class had begun.

我们赶到学校时，发现已经开始上课了。

youdao

She joined a close friend, Zilpah Grant, who had begun another private school, Ipswich Female Seminary.

VOA: special.2010.06.27

Neath Port Talbot council's education department said the incident took place off school premises and before the school day had begun.

BBC: Pupils smoked drugs before school

By the time he reached high school, he had begun playing in venues around Philadelphia and nearby cities.

NPR: McCoy Tyner On Piano Jazz

There are pupils in these classes who had begun school, but who were stopped from attending lessons under the Taleban regime.

BBC: Afghan girls' second chance